In this lesson, we will look at the formula used to calculate the area of a triangle. You will learn it with the help of some
examples and practice questions with solution, using video explanations by the instructor.
You will look at some of the formulas used to calculate the areas of triangles.
If the base of a triangle is b and the height is h, then the area of the triangle is: 1/2 x base x height.
(More text below video...)

Area of a Triangle - Areas of Polygons and Circles - Watch video (Geometry)

If the base of a triangle is b and the height is h, then the area of the triangle is: ½ × base × height. E.g. if base of a triangle is 20 cm and height 10cm, then calculated area using formula is ½ × 20 × 10 = 100 cm2.

(Continued from above)
E.g. if base of a triangle is 20 cm and height
10cm, then calculated area using above formula is 1/2 x 20 x 10 = 100 cm2.
If base of the triangle and its area is known, then height is given by: height =
2 x Area/Base. E.g. if the area of a triangle is 300 cm2 and height is
10 cm, then base is 60 cm.
If three sides of a triangle a, b, c are given, we can use Heron's formula:
Area = ((s)(s
- a)(s - b)(s - c)) where s= (a + b + c)/2
Given the lengths of two sides of a triangle a, b and the measure of angle C between them, the following formula can be used:
Area of triangle = 1/2 ab sin C .

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